The Mk. V revolvers from Colt company, such as Trooper Mk.V, Lawman Mk.V, first appeared in 1982, as an improved versions of the earlier Mk.III revolvers with same names.The improvements were not that radical, with major attention done to the trigger group: the main spring became longer, while the hammer path beccame shorter. This resulted in shorter lock time and helped to improve accuracy. Other improvements were less significant and mostly regarded to the manufacturing process.